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GB377952A - Improvements in or relating to afocal objectives - Google Patents

Improvements in or relating to afocal objectives

Info

Publication number
GB377952A
GB377952A GB3081/31A GB308131A GB377952A GB 377952 A GB377952 A GB 377952A GB 3081/31 A GB3081/31 A GB 3081/31A GB 308131 A GB308131 A GB 308131A GB 377952 A GB377952 A GB 377952A
Authority
GB
United Kingdom
Prior art keywords
lens
glass
cemented
crown glass
achromatism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3081/31A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HARRY SIDNEY NEWCOMER
Original Assignee
HARRY SIDNEY NEWCOMER
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HARRY SIDNEY NEWCOMER filed Critical HARRY SIDNEY NEWCOMER
Publication of GB377952A publication Critical patent/GB377952A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/08—Anamorphotic objectives

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

377,952. Optical systems. NEWCOMER, H. S., 410, East 57th Street, New York, U.S.A. Jan. 30, 1931, No. 3081. Convention date, Jan. 30, 1930. Void [Published under Sect. 91 of the Acts]. [Class 97 (i).] Anamorphotic systems; lenses.-An afocal anamorphotic objective, corrected for achromatism, astigmatism, spherical aberration, coma, and distortion consists of a positive cylindrical lens 21 and a negative cylindrical lens 22. The positive lens consists of a double convex element of crown glass cemented to a meniscus element of flint glass, and the negative lens consists of a meniscus element of flint glass cemented to a double concave element of crown glass. The refractive index of the crown glass exceeds 1.55 and that of the flint glass is from 0 to 2.5 per cent greater than that of the crown glass. In each lens the power of the cemented surface is of opposite sign to that of the lens as a whole. The correction for achromatism is centred at the short wave length end of the portion of the spectrum for which the objective is designed to be used. Numerical data are given.
GB3081/31A 1930-01-30 1931-01-30 Improvements in or relating to afocal objectives Expired GB377952A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US377952XA 1930-01-30 1930-01-30

Publications (1)

Publication Number Publication Date
GB377952A true GB377952A (en) 1932-08-04

Family

ID=21896382

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3081/31A Expired GB377952A (en) 1930-01-30 1931-01-30 Improvements in or relating to afocal objectives

Country Status (1)

Country Link
GB (1) GB377952A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644037A (en) * 1969-04-28 1972-02-22 Ck Optical Co Inc Anamorphic lens systems
CN114152145A (en) * 2021-12-21 2022-03-08 湖南华南光电(集团)有限责任公司 Compact wide-field white light sighting telescope optical system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644037A (en) * 1969-04-28 1972-02-22 Ck Optical Co Inc Anamorphic lens systems
CN114152145A (en) * 2021-12-21 2022-03-08 湖南华南光电(集团)有限责任公司 Compact wide-field white light sighting telescope optical system

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